diff --git a/crates/languages/src/c/highlights.scm b/crates/languages/src/c/highlights.scm
index 2798bc7734fe11826a949bfa87076f221c7e5f5b..578ef7aedda304f0e7e0b0ffee61e2761d62b918 100644
--- a/crates/languages/src/c/highlights.scm
+++ b/crates/languages/src/c/highlights.scm
@@ -29,6 +29,8 @@
 [
   "#define"
   "#elif"
+  "#elifdef"
+  "#elifndef"
   "#else"
   "#endif"
   "#if"
diff --git a/crates/languages/src/cpp/highlights.scm b/crates/languages/src/cpp/highlights.scm
index 44631ca0e0e8040e10151b503b9982e5fa52deb9..42ac231b0efa343f37c33eb6005e504e1151f85d 100644
--- a/crates/languages/src/cpp/highlights.scm
+++ b/crates/languages/src/cpp/highlights.scm
@@ -168,6 +168,8 @@ type: (primitive_type) @type.builtin
 [
   "#define"
   "#elif"
+  "#elifdef"
+  "#elifndef"
   "#else"
   "#endif"
   "#if"